Ratchet transmission for motor vehicles



March 24. 1925.

H. TOUTEE RA'rcHE'r TRANSMISSION .Fon uoro' VEHICLES Patented Mana 24,.1925.-

UNITEDsTA'rr-:s PATENT OFFICE.

HENRI TOUVTEE, OF PARIS, FRANCE, AssIoNoR To LA soCm'TE .ANONYME DELAUTO DERRAYAQE T. L., or MONTROUGE, SEINE, FRANCE, A CORPORATION orFRANCE.

RATCHET TRANSMISSION FOR-MOTOR VEHICLES.

Application moa Inno 13,1922. sonni No. 567,980.

Anas loft-hond Sido aio oovay Within T0 all whom, t may concern.'

Be it known that I, HENRITOUTE, a citizenof the French Republic, and aresident of 'Pai-is, France, whose postal address is l Rue Felix Ziem,Paris, France, have invented new and useful Improvements in RatchetTransmissions for Motor Vehicles, of which the following is aspecification.

The present invention relates to transmission mechanism interposedbetween the motor and the change speed gear of an automobile vehicle, soas to facilitate the change of gear and to permit the vehicleautomatically to coast or travel by impetus without turning the engine,and the engine to drive the vehicle as soon as the engine speed exceedsthat of the transmission shaft connectedt to the wheels.

The resent invention has for its object, the utilization oftransmissions in which the connection of the two parts of thetransmission is produced by a Cone clutch, the control ot which iseiected by la screw and nut device.

- The annexed drawing represents by way of exam le, the preferred formof construeI tion of t v e invention. p

Figure 1 is a longitudinal axial section, with parts in elevation.

Figure 2 is al transverse sectional view;

Fi re 3 is a longitudinal section vof a spee change device, showing theposition occupied by the subject of invention.

It will be noted that in the form of construction shown the movablescrew member or nut of the transmission mechanismy is mounted upon thepart fast to the driven shaft. This arrangement -allows the said nut tobe relieved of the forces of inertia generated by the variations `inspeed of the driven shaft when the ear-train in me'sh is suddenlyreplaced by t e next train of different veloclty-ratio.

All the members of the Cone-clutch are `arranged inside the ear-boxwithin a housing formed in the' slidmg gear which serves for the directdrive and the next lower gear.

,Upon the shaft m of the sliding gear, there is mounted upon a feather,the screw b meshing with the nut c of which the exterior forms the malecone c1. `Around these parts is revolubly mounted the female cone d.comprising external spurear teeth d1 and a circular groove d2 m w ichthe striking fork of the sliding gear engages,

which the 'clutch members are fitted, is closed by a boss-plate 'ncarrying the dogs ,nl rfor the direct drive. The periphery of thislplate is cut likel a star, the rays or points of which engage incorrespondingly shaped notches in the part d, so that any rotation ofthe parts d and n in relation to one another is impossible; an annularnut 0 Completes the connection of the boss-plate 'a to the gear d.

A spring g consisting of a coiled spring, bearing at'one end against astop b1 solid with the screw and at the other end against a stop 02solid with'the nut c, is located in a recess formed in the nut c and thescrew b, along a portion of the screw thread and on the inactiveside ofthe latter. The spring g tends constantly to revolve the nut c 1n thedirection bringing together the cones c1 and d. The direction of thethreads upon the screw b is determined so that the cones 01 and d arepressed against one another whenthe driving shaft tends to. rotate morequickly than the driven member and that in the contrary case the conesmove apart, Overcoming the action of the spring g.

The transmission only loperates for either one of two speeds (directdrive and lower gear) to bringA the'- cones in engagement as shown inFig. 3, and this same arrangement presents the advantage that it can befitted without any modification of the vehicle, by

mere substitution of the s ecially 'formed sliding gear as described orthe existing sliding gear of the change speed gear.

Ashaft q driven by a prime mover and referred toin this specification asthe driving shaft, carries clutch lingers 'n3 for cooperatwith the dogsn1, carried by cone member d.

In this form of construction the screw and nut are mounted upon thedriven shaft so that the nut is relieved of the forces of inertiagenerated by the. sudden engagement of one or other O the two gearsprovided by the direct-drive sliding gear.

n will bo understood una the invention io not Vlimited to the details ofconstruction which have been described; thus for example the sha e andthe yposition of the spring may be mo `Itied, as well as the relativemountin of the diierent parts.

' at I claim isz,-

1.' A. vehicle transmission of the type described, comprising a drivingshaft, a driven shaft, a slidmg gear element serving for thc directdrive 'and the next lower gear, a rst screw-threaded memberslidablymounted on the driven shaft, a second screw-threaded member engagingwith the first screw.- threaded member, a'first clutch member fast withsaid second screw-threaded member, a second clutch member cooperatingwith the first clutch member and fast with the sliding 'gear element anda drive connection between tefe'cond clutch member and thedriving s a 2.A vehicle transmission of the typedcscribed, comprising'a driving shaft,a driven shaft, a sliding gear element serving for the direct driveV andthe` next` lower gear,4 a screw-threaded member slidably mounted on thedriven shaft, another corresondingjscrew-threaded lmember engaging t efirstv screw-threaded member, al cone clutch surface upon said secondscrew-threaded member, a cone-clutch surface' upon the sliding gearelement and cooperating withtherst cone clutch surface, spring meansnormally biasing thetwo cone clutch surfaces together land a driveconnection between the cone g gear element Witnesses: A

JIABMENGAUD, AINE, P. ARMENGAUD.

